Armature-core.



No. 674,505. Patented May 2:, l90l.

H. E. HEATH.

ARMATUBE CORE {Appijcatidn filed on. 4, 1960.

(No Model.)

"m: "arms ram: 50.. www.mm, WASNINGTON, n. c.

' 50 of the frame are ribs 5.

UNITED STATES PATENT OFFICE.

HARRY E. HEATH, OF WINDSOR, CONNECTICUT, ASSIGNOR TO THE EDDY ELECTRIC MANUFACTURING COMPANY, OF SAME PLACE.

ARMATU RE-CO RE.

SPECIFICATION formingpart of Letters Patent No. 674,505, dated May 21, 1901.

Application filed October 4, 1900. Serial No. 32,020. (No model.)

To all whom it may concern:

Be it known that I, HARRY E. HEATH, a citizen of the United States, residing at Windsor, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Armature-Cores, of which the following is a'specification.

Thisinvention relatesto the method of forming and connecting the frame and laminae of an armature-core.

The object of the invention is the production of an armature-core that is simple and cheap to build and that is eflicient and durable in use. v

The invention is more particularly intended to facilitate the construction of the cores of large armatures of the drum type, although it is applicable to the cores of armatures of other types.

The core that embodies the invention may be used in building an armature for either a direct or alternating current generator or motor, and it has a frame provided on its cylindrical rim with adjustable ribs that extend z 5 substantially parallel with the axis of the core, sectional laminae mounted upon the frame and having mortises receiving the ribs, and means for. drawing the ribs toward the axis of the core, so as to bind the lamina-sections so tightly together and hold them close to the frame.

In the accompanying drawings the invention is illustrated with relation to a drum armature-core in which each lamina is formed of two pieces, and Figure 1 is a transverse section of such a core. Fig. 2 is a diametrical' section of this core, and Fig. 3 .shows moditied methods of connecting the frame and laminm according to the invention.

The frame of this armature-core may be made of any metal, but is usually cast of iron, with a shaft-hub 1, spokes 2, and a cylindrical rim 3. The rim of the frame may be a complete cylinder, as shown in Fig. 1, or the rim may be composed of separated segments of a cylinder, as shown in Fig. 3. Grooves 4: are

formed parallel'with the axis of the core in the outer surfaces of the rim.

Adj ustably located in the peripheral grooves The outwardly-projecting portions of these ribs may be dove ing upon the walls of the mortises will draw The drawing of the laminae inwardly in this tail in shape, as shown at 6, T-shaped, as shown at 7, L-shaped, as shown at 8, or any othershape which will hold the lamina-sections against outward movement under centrifugal action when the armature is rotating. These ribs are held in place and may be drawn toward the axis of theframe by screw-bolts 9.

The laminae 10 are shown as stamped in two sections from thin sheet-iron, although they may be stamped in any number of sections. These lamina-sections have their inner edges shaped to fit the cylindrical rim of the core-frame, and in their inner edges are mortises ll of a size and shape to receive the outwardly-projecting portions of the ribs that are secured to the frame-rim. The outer edges of the laminae may be notched in the usual manner for the armature-coils. The ribs are seen red to the frame, and then the laminasections are slipped flatwise on the frame, the mortises in the sections being occupied by the ribs projecting from the frame. The laminasections may be placed about the cylinder, so as to break joints,as indicated in the drawings. After the core has been built up by slipping the lamina-sections upon the frame the bolts holding the ribs may be turned so that the dovetails or other projecting parts of the ribs actthe laminae radially inward and cause them to bind tightly against the outer surfaces of the rim of the frame and also cause the end joints of the sections to tightly bind together.

way insures an efficient contact between the ends of the sections and the inner edges of thesections and the rim of the frame.

A flange 12 may be fixed to one end of the rim of the frame, and a flange 13 maybe ad- 0 ijustably attached to the other end of the frame such manner as to resist all tendency to separation under centrifugal action. By this means an efficient armature-core is produced without the exercise of great care in fitting the parts. The ribs also act as keys for connecting the laminations with the core at a number of diflerent points around the rim, and thus equalize the strains between the frame and laminae incident to driving.

I claim as my invention-- 1. An armature-core consisting of a frame, undercut ribs extending along the outer surface of the rim parallelwith and adjustable toward and from the axis of the frame, means for adjusting the ribs radially of the frame, and annular sectional laminae fitting the rim of the frame and having mortises receiving the undercut ribs, substantially as specified.

2. An armature-core consisting of a frame, dovetailed ribs extending along the outer surface of the rim parallel with and adjustable toward and from the axis of the frame, means for adjusting the dovetailed ribs radially of the frame, and annular sectional laminae fitting the rim of the frame, and having mortises receiving the dovetailed ribs, substantially as specified;-

3. An armature-core consisting of a frame,

undercut ribs extending along the outer surface of the rim parallel with and adjustable toward and from the axis ofthe frame, bolts projecting outwardly through the rim of the frame into the undercut ribs for adjusting the ribs radially of the frame, and annular sectional'laminm fitting the rim of the frame and having mortises receiving the undercut ribs, substantially as specified.

HARRY E. HEATH.

Witnesses:.

H. R. WILLIAMS, V. R. HOLCOMB. 

